I have had my pool for about 7 years. It is about 100,000 L (25,000 US gallons) and has a Jandy Aquapure SWG. I have never had any problems with it. I have a paper cartridge filter so no backwashing.
This year I added CYA when the pool was first opened in mid-May (which is usual) and then again a couple of weeks ago I added about 2kg of CYA due to low readings. But when I take it to my shop to get tested the CYA is very low so I am now adding more. My chlorine readings have also been low so I have had to supplement the SWG with liquid chlorine. Is there any reason why my CYA would not stay in the pool? Normally I just add CYA at the beginning of the year and then I am ood.
The only thing that has changed this year is that I have added solar heating panels - the evacuated tube type. The guy who installed these for me has had some issues adjusting these properly and for some reason the solar panels seem to be allowing air to enter my system - it bubbles out of the jets. Could too much air (or Oxygen) cause issues with the CYA? Or is it getting burnt out by the solar tubes?